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Re: st: AW: tsset on subsample of observations


From   "Robert Duval" <rduval@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: AW: tsset on subsample of observations
Date   Sat, 11 Nov 2006 17:13:14 -0500

Hi Tom,

Thanks for the suggestion, however it doesn't really get at what I want,...

After defining tsset, I want to create variables like

gen z = x-l.x

and keep this variables in the dataset. For the duplicate obs. z
should take missing values.

By using -preserve- / -restore- I lose z after restoring the old dataset.

Any other suggestion will be greatly appreciated

robert

On 11/11/06, Thomas Erdmann <tom.erdmann@web.de> wrote:
Couldnt you work with -preserve- and -restore- ?

duplicates tag x y, generate(dup)
preserve
drop if dup~=0
tsset x y
...
restore

Wouldn't it be better to keep one of the duplicate observations?
Duplicates drop, force
Instead of
Drop if dup~=0

- Tom




-----Ursprüngliche Nachricht-----
Von: statalist-owner@hsphsun2.harvard.edu
[mailto:statalist-owner@hsphsun2.harvard.edu] Im Auftrag von Robert Duval
Gesendet: Samstag, 11. November 2006 21:21
An: statalist@hsphsun2.harvard.edu
Betreff: st: tsset on subsample of observations

Dear All,

Is there a way to tsset a subsample of my observations?

I want to perform operations that involve time series commands, but if
I consider my entire dataset I have repeated time values within the
panel.

I would like to Stata to tsset my observations for that subset of obs.
that are uniquely identified within each panel... something like:

tsset x y if unique==1

Is there a way to do this?

Otherwise I would be forced to drop the repeated observations, but
since I need those obs. for other exercises this will force me to save
datasets: one with duplicates and another one without them. Something
that seems highly inefficient.

Any help would be greatly appreciated.
robert
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